380 citations
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9 papers · 1 filter
Nearly extremal apparent horizons in simulations of merging black holes
Geoffrey Lovelace, Mark A. Scheel, Robert Owen +9
The spin angular momentum of an isolated Kerr black hole is bounded by the surface area of its apparent horizon: , with equality for extremal black holes. In thi…
The Quasinormal Modes of Weakly Charged Kerr-Newman Spacetimes
Zachary Mark, Huan Yang, Aaron Zimmerman +1
The resonant mode spectrum of the Kerr-Newman spacetime is presently unknown. These modes, called the quasinormal modes, play a central role in determining the stability of Kerr-Ne…
A 24-Hour Global Campaign To Assess Precision Timing of the Millisecond Pulsar J1713+0747
T. Dolch, M. T. Lam, J. M. Cordes +40
The radio millisecond pulsar J1713+0747 is regarded as one of the highest-precision clocks in the sky, and is regularly timed for the purpose of detecting gravitational waves. The…
Millisecond Pulsar Scintillation Studies with LOFAR: Initial Results
Anne M. Archibald, Vladislav I. Kondratiev, Jason W. T. Hessels +1
High-precision timing of millisecond pulsars (MSPs) over years to decades is a promising technique for direct detection of gravitational waves at nanohertz frequencies. Time-variab…
Hofstadter's Cocoon
Katherine Jones-Smith, Connor Wallace
Hofstadter showed that the energy levels of electrons on a lattice plotted as a function of magnetic field form an beautiful structure now referred to as "Hofstadter's butterfly".…
Quasinormal Modes Beyond Kerr
Aaron Zimmerman, Huan Yang, Zachary Mark +2
The quasinormal modes (QNMs) of a black hole spacetime are the free, decaying oscillations of the spacetime, and are well understood in the case of Kerr black holes. We discuss a m…